10 answers to questions on working with the customer

After the last PM-Weekend we managed to catch selikhovkin and ask to record a few videos on the most popular issues about project management. Today is the first video:

10 answers to questions about working with the customer

As part of the video, Ivan tezno revealed the following questions:

1. How to interest a business in improving the maturity of the management system?
2. Methods for building customer expectations for the project and their use
3. How to understand what the customer wants?
4. How to keep a customer from inflating requirements?
5. How to teach the customer to trust the developer?
6. What are the methods / methodologies of project management and communication with the customer?
7. Sabotage customer employees (how to deal)?
8. How to inform the customer that the project is not going according to plan, what phrases to use, how to smooth the impression?
9. Features of work with government customers
10. What should a manager do on a project that a customer lets go of course?

It is clear that about each question you can safely hold 2-hour sessions (maybe the next PM-Weekend meetings will be done on these topics), but I wanted to make an abstract, brief and useful material. We would be grateful for the feedback.
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PS In the words of Ivan about the specifics of the methodologies, depending on the type of business of the company, I already began to bounce, so I wanted to argue. Therefore, my friends, if there is something to supplement, argue or confirm the above, we will be grateful for the comments.